Spiral shield for a flexible high-Q implantable inductively coupled device
First Claim
1. An improved secondary coil assembly for inductive power reception, the secondary coil assembly comprising:
- a winding comprising a plurality of turns;
a shield wound around the winding; and
encapsulation comprising a bio-compatible, polymer, low dielectric material;
wherein the shield and winding reside in the encapsulation, and wherein the shield shields the winding.
5 Assignments
0 Petitions
Accused Products
Abstract
A spiral shield for an implantable secondary coil confines the electrical field of the coil, and thus prevents capacitive coupling of the coil through surrounding dielectrics (such as human tissue.) Known implantable devices receive power inductively, through a secondary coil, from a primary coil in an external device. Efficient power reception requires that the coils be tuned to the same resonant frequency. Use of the spiral shield results in predictable electrical behavior of the secondary coil and permits the secondary coil to be accurately tuned to the same resonate frequency as the primary coil. To further improve performance, spacers made from SILBIONE®LSR 70 reside between turns of the coil to reduce turn to turn and turn to shield capacitances. Reducing the capacitances prevents excessive reduction of the self resonant frequency of the coil. The coil is imbedded in SILBIONE®LSR 70, allowing for a thin and flexible coil.
101 Citations
26 Claims
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1. An improved secondary coil assembly for inductive power reception, the secondary coil assembly comprising:
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a winding comprising a plurality of turns;
a shield wound around the winding; and
encapsulation comprising a bio-compatible, polymer, low dielectric material;
wherein the shield and winding reside in the encapsulation, and wherein the shield shields the winding. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
the winding is encapsulated in SILBIONE®
LSR 70, and wherein the secondary coil assembly is flexible and conforms to the contours of an implant site;
magnet is molded into the center of the SILBIONE®
LSR 70;
the turns are formed from a multi-stranded wire in a sheath made of the SILBIONE®
LSR 70; and
a spacer made of the SILBIONE®
LSR 70 resides between adjacent turns, wherein the spacer separates the turns, and separates the inner-most turn from the shield, and separates the outer-most turn from the shield.
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14. A method for constructing a shielded and flexible secondary coil assembly comprising:
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forming a winding comprising turns;
winding a spiral shield toroidally around the winding;
encapsulating the winding and spiral shield in a first bio-compatible, polymer, low dielectric material;
connecting the winding to an electrical device. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A secondary coil assembly for inductive power reception for an Implantable Cochlear Stimulation (ICS) system, comprising:
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a winding comprising a plurality of turns of a multi-stranded wire in a sheath;
a spacer residing between the turns;
a spiral shield toroidally wound around the winding; and
encapsulation made from a bio-compatible, polymer, low dielectric material, wherein the spiral shield, the spacer, and the winding reside in the encapsulation. - View Dependent Claims (22, 23)
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24. A secondary coil assembly for inductive power reception for an Implantable Cochlear Stimulation (ICS) system, comprising:
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a winding comprising a plurality of turns of a multi-strand wire in a sheath;
a spacer residing between the turns;
a shield, wherein the shield comprises an alternating pattern wherein the alternating pattern reaches alternatively to one side of the winding, and then reverses and reaches over the winding to the opposite side of the winding, as the shield progresses around the circumference of the winding; and
encapsulation comprising a bio-compatible, polymer, low dielectric material, wherein the shield, the spacer, and winding reside in the encapsulation. - View Dependent Claims (25, 26)
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Specification